Hi John;
I do not know from personal experience. Most commonly, the reason for the shunt is to keep the large wires out of the cockpit, so they are usually pretty near the generator/alternators. Try to follow the large wires from the generator/alternator at the engine.
According to the drawing you referenced, there’s a mount for the shunts. I would look on the forward side or aft side of the firewall to start.
